Tool-grinder.



P. SCHMIDT.

TOOL GRINDER.-

APPLICATION FILED 001222, 1913.

Patented Mar. 2, 1915.

NORRIS PETERS CO PHOTQLITHOV, WASHINGTON, L C.

.llTE S3TATE PATENT QEFKQEQ PAUL SCHMIDT, 0F VIENNA, AUSTRIA-HUNGARY.

TOGL GRINDER.

To all whom it may concern:

Be it known that 1, PAUL SCHMIDT, managing director, a subject of theKing of Prussia, and a resident of 30 Ybbsstrasse, Vienna, 11, in theEmpire of Austria-Hungary, iave invented a Tool-Grinder; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to tool grinding machines and, particularly, togrinders for grinding toothed cutting tools, and a primary object is toprovide a grinder in which the movement of the rotating grinding wheelrelatively to the work piece is caused by the axle which carries thegrinding Wheel being mounted eccentrically or slantwise in a shaft sothat when the latter rotates the grinding wheel is moved bodilyrelatively to the workpiece and is moved toward and away from the same.

To this end, my invention consists in the construction, arrangement andcombination of parts described hereinafter and pointed out in theclaims.

One embodiment of my invention is represented by way of example in theaccompanying drawing, wherein Figure l is an elevation of a grinder forgrinding saw-blades, Fig. 2 is a horizontal section thereof, and Fig. 3is a diagram showing the eccentrically mounted grinding-wheel axle andthe reciprocatory motion of the grinding wheel produced thereby.

Referring to the drawing, the grinding wheel a is fast on the axle bwhich, in the illustrative embodiment, is eccentrically jcurnaled in theshaft 0. The axle Z) is driven by the belt-pulley (Z and the shaft 0 bythe belt-pulley e. In consequence of the grinding wheel a being mountedeccentrica-lly, during each revolution of the shaft 0 the grinding wheelmust move once to and fro, and this movement suffices to cause the sameto enter into the gaps between the teeth of the saw-blade 7 and to grindthe teeth. I provide that the shaft 0 also causes Copies of this patentmay be obtained for Specification of Letters Patent.

Patented Mar. 2, 1915,

Application filed flctober 22, 1913. Serial No. 796,656.

he saw-blade f to be rotated. To this end, the one end of this shaft isformed as a cam g. This cam occupies such a position relatively to theeccentric bore in the shaft that the saw-blade is fed forward while thegrinding wheel is farthest thereirom. The motion of th cam g istransmitted by the anti-friction roller h to the lever 11 which isfuicrumed at one end on the pivot k and carries at its other end abraking spring Z which drives the saw-blade in the direction indicatedby the ar'ow When the lever rocks back the saw-blade is held by thelocking spring we while the breaking spring Z slides over the saw-blade.The spring 0 holds the roller it of the lever t' constantly in contactwith the cam g of the controlling shaft 0. The saw-blade rotates freelyon the pin 7) of the carrier 1" which can be shifted on the rod 8.

l/Vhat I claim as my invention and desire to secure by Letters Patentis:

1. A. tool grinder comprising a shaft, an axle journaled eccentricallyin said shaft, a grinding wheel carried by said axle, means for drivingsaid shaft, and means for independently driving the axle of the grindingwheel.

2. In a tool grinder, the combination of a shaft having an eccentricbore longitudinally through the same, an axle in said bore, a grindingwheel on the axle, and workpiece feed-mechanism actuated by said shaft,substantially as described.

3. In a tool grinder, the combination of a shaft having an eccentricbore longitudinally through the same, an axle in said bore, a grindingwheel on the axle, one end of the shaft constituting a cam, andworkpiece feed-mechanism actuated by said cam, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses:

PAUL SCHMIDT.

Witnesses FRANZ Rnirnn, KARL RnHMs.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G."

